Garmin GTR 225 Installation Manual page 90

B.2.4.2 Output Messages
B.2.4.2.1 COM Transceiver Status
This message is used to output the current status of the GTR/GNC COM. It will be output at the configured
message rate (1 Hz) or whenever the status changes.
Message format:
"C" ..........................Message class. This is a GTR/GNC COM message.
"01".........................Message identifier.
mk ...........................Active frequency: m = MHz, where m = desired MHz frequency - 30h,
mk ...........................Standby frequency: m = MHz, where m = desired MHz frequency - 30h,
a...............................Transceiver status:
s ...............................Squelch setting: (ASCII) 0 = automatic; 1 = manual override ("SQ" shown in
hh ............................COM channel spacing: (ASCII) 25 = 25 kHz mode; 83 = 8.33 kHz mode.
o ..............................Active frequency 8.33 kHz offset: (ASCII) 0 = 25 kHz frequency (.000);
o ..............................Standby frequency 8.33 kHz offset: (ASCII) 0 = 25 kHz frequency (.000);
Example message:
$PGRMC01G4LFR08303<chksm><CR><LF>
Active frequency is 119.100MHz, the standby frequency is 124.565MHz, unit is receiving, squelch is
automatic, and the unit is in 8.33 kHz mode.
NOTE
This message is output at a nominal one second rate, or faster whenever the transceiver
function or status changes.
190-01182-02
Rev. F
ranging from 118 to 136 MHz, (i.e. 76h to 88h, A2h); k = (kHz offset / 25
kHz) + 30h, ranging from 000 to 975 kHz in 25 kHz steps.
ranging from 118 to 136 MHz, (i.e. 76h to 88h, A2h); k = (kHz offset /
25 kHz) + 30h, ranging from 000 to 975 kHz in 25 kHz steps.
I = Intercom (no other status applicable)
R = Normal receive
M = Monitor receive
T = Transmit active
S = Stuck mic
F = COM failure
upper-left corner of COM active frequency.)
1 = first 8.33 kHz channel offset (.005); 2 = second 8.33 kHz channel offset
(.010); 3 = third 8.33 kHz channel offset (.015).
1 = first 8.33 kHz channel offset (.005); 2 = second 8.33 kHz channel offset
(.010); 3 = third 8.33 kHz channel offset (.015)
GTR 225/GNC 255 TSO Installation Manual
Page B-14